THE chief executive of anti-Brexit campaign group Best for Britain admits “it’s no secret, our mission is to stop Brexit” after coming under intense scrutiny for receiving a sizeable contribution from a foreign billionaire.

Best For Britain was handed £400,000 by billionaire investor George Soros, leading the group to declare it had followed rules governing financial contributions “to the letter”.

The group, founded by Gina Miller – who has since distanced herself from the organisation – to fund election campaigns for anti-Brexit MPs.

Theresa May’s former chief of staff Nick Timothy said the donation, which he sees as a “secret plot” to “thwart Brexit” should be seen as a “wake-up call” to the Conservative Government.

“The objective is to convince MPs to vote against the deal Theresa May negotiates with Brussels, regardless of its content and despite the risk that doing so could mean Britain leaves the EU with no alternative agreement in place,” he wrote in the Telegraph.

However, Eloise Todd, Best For Britain’s chief executive, rebuked “the idea of a secret plot”.

Speaking to LBC, she said: “The idea of a secret plot, we’ve got one mission, and that is to try and stop Brexit – that’s clear on our website that’s been up since April.

“There’s no secrecy at all and I think the secrecy that’s been around Brexit is really around No.10 and David Davis’ department.

“Have they got assessments? Have they not? What will the impact be? Why are they hiding information?

“Really what we want to have is the kind of debate that we didn’t have during the referendum campaign.”

The anti-Brexit group’s chairman Lord Malloch-Brown, a former minister and diplomat, also hit out at any criticism of the financial contribution from Mr Soros.

He said: “We have never hidden our agenda; we have been campaigning hard to win a meaningful vote on Brexit, which we did, and to keep all options on the table, including staying in the European Union.

“We, like millions of people, believe that Britain should lead, not leave Europe.